JP7062490B2 - Display device - Google Patents

Description

Embodiments of the present invention relate to display devices.

In recent years, a display device provided with a touch sensor for detecting the approach or contact of an object with the display device has been put into practical use. As an example, a display device having a touch sensor not only in a display unit for displaying an image but also in a peripheral area of the display unit has been proposed.
By the way, in a touch sensor in which sensor electrodes are arranged in a matrix, a time constant difference occurs between the sensor electrodes due to a difference in the wiring length of the sensor wiring connected to each sensor electrode, resulting in deterioration of detection performance. May invite.

Japanese Unexamined Patent Publication No. 2017-102454

An object of the present embodiment is to provide a display device that suppresses deterioration of detection performance.

According to this embodiment
The first electrode, the second electrode separated from the first electrode, at least one first wiring electrically connected to the first electrode, and at least one electrically connected to the second electrode. The second wiring of the book, the first wiring, and the control unit electrically connected to the second wiring are provided, and the first electrode and the second electrode are located on the display unit, and the first electrode is located on the display unit. The electrode is connected to the first wiring at a position farther from the control unit than the second electrode, and the second electrode is connected to the second wiring at a position closer to the control unit than the first electrode. However, a display device is provided in which the number of the first wiring is larger than the number of the second wiring.
According to this embodiment
The first electrode, the second electrode separated from the first electrode, the first wiring electrically connected to the first electrode, and the second wiring electrically connected to the second electrode are provided. The first electrode and the second electrode are located on the display unit, the wiring length of the first wiring is longer than the wiring length of the second wiring, and the first wiring is the first electrode and the first electrode. A display device is provided that intersects the second electrode and the second wiring intersects the second electrode.
According to this embodiment
A display unit and a non-display unit that surrounds the display unit are provided, and the control unit arranged in the non-display unit is electrically connected to the control unit and arranged side by side in the first direction in the display unit. The first wiring and the second wiring extending in the second direction intersecting the first direction, the first electrode arranged on the display unit, and the first electrode separated from the first electrode in the second direction. A display device having two electrodes, wherein the second electrode is closer to the control unit than the first electrode, and the first electrode intersects the first wiring and contacts the first wiring. Provided is a display device that is electrically connected via a portion, the second electrode intersects the first wiring and the second wiring, and is electrically connected to the second wiring via a contact portion. To.

FIG. 1 is a plan view showing a configuration example of the display device DSP of the present embodiment. FIG. 2A is a plan view showing a connection relationship between a part of the sensor electrodes Rx shown in FIG. 1 and the sensor wiring L. FIG. 2B is a plan view showing the connection relationship between the sensor electrode Rx1 shown in FIG. 2A and the sensor wiring L1. FIG. 2C is a plan view showing the connection relationship between the sensor electrode Rxn and the sensor wiring Ln shown in FIG. 2A. FIG. 3 is a plan view showing the sensor electrode Rx shown in FIG. FIG. 4 is a diagram showing a basic configuration of a pixel PX and an equivalent circuit. FIG. 5 is a plan view showing an example of the pixel layout. FIG. 6 is a cross-sectional view of the display device DSP along the line AB shown in FIG. FIG. 7 is an enlarged plan view showing a main part of the first substrate SUB1. FIG. 8 is a cross-sectional view of the first substrate SUB1 along the CD line shown in FIG. 7. FIG. 9 is a cross-sectional view of the display panel PNL along the line EF shown in FIG. FIG. 10 is a diagram for explaining the capacitance C1 between the common electrode CE1 and the metal wiring ML2. FIG. 11 is a diagram showing a case where the sensor wiring L1 connected to the sensor electrode Rx1 is four. FIG. 12 is a diagram showing a case where the sensor wiring L1 connected to the sensor electrode Rx1 is one.

Hereinafter, this embodiment will be described with reference to the drawings. It should be noted that the disclosure is merely an example, and those skilled in the art can easily conceive of appropriate changes while maintaining the gist of the invention, which are naturally included in the scope of the present invention. Further, in order to clarify the explanation, the drawings may schematically represent the width, thickness, shape, etc. of each part as compared with the actual embodiment, but the drawings are merely examples and are merely examples of the present invention. It does not limit the interpretation. Further, in the present specification and each figure, the same reference reference numerals may be given to the components exhibiting the same or similar functions as those described above with respect to the above-mentioned figures, and the overlapping detailed description may be omitted as appropriate. ..

FIG. 1 is a plan view showing a configuration example of the display device DSP of the present embodiment. In one example, the first direction X, the second direction Y, and the third direction Z are orthogonal to each other, but may intersect at an angle other than 90 degrees. The first direction X and the second direction Y correspond to the directions parallel to the main surface of the substrate constituting the display device DSP, and the third direction Z corresponds to the thickness direction of the display device DSP. In the present specification, the position on the tip side of the arrow indicating the third direction Z is referred to as an upper position, and the position opposite to the tip of the arrow is referred to as a lower position. In the case of "the second member above the first member" and "the second member below the first member", the second member may be in contact with the first member or may be separated from the first member. You may. Further, it is assumed that there is an observation position for observing the display device DSP on the tip side of the arrow indicating the third direction Z, and the observation position is directed toward the XY plane defined by the first direction X and the second direction Y. Seeing is called plan view.

Here, a plan view of the display device DSP in the XY plane is shown. The display device DSP includes a display panel PNL and an IC chip 1. The display panel PNL includes a first substrate SUB1, a second substrate SUB2, and a touch sensor TS. The first substrate SUB1 and the second substrate SUB2 are superimposed in a plan view. The display panel PNL includes a display unit DA for displaying an image and a frame-shaped non-display unit NDA that surrounds the display unit DA. The touch sensor TS and the display unit DA are located in the region where the first substrate SUB1 and the second substrate SUB2 are superimposed. In the illustrated example, the touch sensor TS is provided in the display unit DA, but may also be provided in the non-display unit NDA.

The first substrate SUB1 has a mounting portion MA extending in the second direction Y from the second substrate SUB2. The IC chip 1 is connected to the mounting unit MA. The IC chip 1 may be connected to a flexible printed circuit board connected to the mounting unit MA. The IC chip 1 has a built-in display driver DD and a touch controller TC. The display driver DD outputs a signal necessary for displaying an image such as a video signal to the display panel PNL in the display mode for displaying the image. The touch controller TC controls the touch sensor TS in the touch sensing mode for detecting the approach or contact of an object with the display device DSP. The touch controller TC may be built in an IC chip different from the display driver DD.

Here, the self-capacity type touch sensor TS will be described, but the touch sensor TS may be a mutual capacity type. The touch sensor TS includes a plurality of sensor electrodes Rx and a plurality of sensor wirings L. The plurality of sensor electrodes Rx are located on the display unit DA and are arranged in a matrix in the first direction X and the second direction Y. In the illustrated example, m sensor electrodes Rx are arranged at intervals along the first direction X, and n sensor electrodes Rx are arranged at intervals along the second direction Y. Note that m and n are integers of 2 or more, and in one example, n is an integer larger than m. One sensor electrode Rx constitutes a sensor block which is the smallest unit capable of touch sensing. The plurality of sensor wirings L extend along the second direction Y in the display unit DA, and are arranged in the first direction X. Each of the sensor wirings L is provided at a position superimposing on the signal line S described later, for example. Further, each of the sensor wirings L is drawn out to the non-display unit NDA, electrically connected to the IC chip 1, and further electrically connected to the touch controller TC inside the IC chip 1.

Here, attention is paid to the relationship between the sensor wirings L1 to L3 arranged in the first direction X and the sensor electrodes Rx1 to Rx3 arranged in the second direction Y. The sensor electrode Rx1 is arranged at the position farthest from the touch controller TC among the sensor electrodes Rx located on the display unit DA. The sensor wiring L1 intersects with n sensor electrodes Rx, extends to a position where it overlaps with the sensor electrodes Rx1, and is electrically connected to the sensor electrodes Rx1.
The sensor electrode Rx2 is arranged at a position closer to the touch controller TC than the sensor electrode Rx1. The sensor wiring L2 intersects with (n-1) sensor electrodes Rx, extends to a position where it overlaps with the sensor electrodes Rx2, and is electrically connected to the sensor electrodes Rx2. The sensor wiring L2 does not intersect the sensor electrode Rx1.
The sensor electrode Rx3 is arranged at a position closer to the touch controller TC than the sensor electrode Rx2. The sensor wiring L3 intersects with (n-2) sensor electrodes Rx, extends to a position where it overlaps with the sensor electrodes Rx3, and is electrically connected to the sensor electrodes Rx3. The sensor wiring L3 does not intersect the sensor electrodes Rx1 and Rx2.
The sensor wiring L1 has a wiring length LR1, the sensor wiring L2 has a wiring length LR2, and the sensor wiring L3 has a wiring length LR3. The wiring lengths LR1 to LR3 are all lengths along the second direction Y in the display unit DA. The wiring length LR1 is longer than the wiring length LR2, and the wiring length LR2 is longer than the wiring length LR3.

The sensor electrode Rxn is arranged at a position closest to the touch controller TC among the sensor electrodes Rx located on the display unit DA. The sensor wiring Ln extends to a position where it overlaps with the sensor electrode Rxn, and is electrically connected to the sensor electrode Rxn. The sensor wiring Ln does not intersect with other sensor electrodes Rx located farther than the sensor electrode Rxn. The sensor wiring Ln has the shortest wiring length LRn among the sensor wiring L.

The dummy wiring D is arranged corresponding to each of the sensor electrodes Rx. For example, the dummy wiring D21 is separated from the sensor wiring L2. The dummy wiring D21 is arranged corresponding to the sensor electrode Rx1 and is electrically connected to the sensor electrode Rx1. The sensor wiring L2 and the dummy wiring D21 are located on the same signal line as described later.
The dummy wiring D31 is arranged corresponding to the sensor electrode Rx1 and is electrically connected to the sensor electrode Rx1. The dummy wiring D32 is separated from the dummy wiring D31 and the sensor wiring L3. The dummy wiring D32 is arranged corresponding to the sensor electrode Rx2 and is electrically connected to the sensor electrode Rx2. The sensor wiring L3 and the dummy wirings D31 and D32 are located on the same signal line.

In the touch sensing mode, the touch controller TC applies a sensor drive voltage to the sensor wiring L. As a result, the sensor drive voltage is applied to the sensor electrode Rx, and touch sensing is performed on the sensor electrode Rx. The sensor signal corresponding to the sensing result at the sensor electrode Rx is output to the touch controller TC via the sensor wiring L. The touch controller TC or an external host detects whether or not the object is approaching or touching the display device DSP and the position coordinates of the object based on the sensor signal.
In the display mode, the sensor electrode Rx functions as a common electrode CE to which a common voltage (Vcom) is applied. The common voltage is applied from the voltage supply unit included in the display driver DD, for example, via the sensor wiring L.

FIG. 2A is a plan view showing a connection relationship between a part of the sensor electrodes Rx shown in FIG. 1 and the sensor wiring L. In the illustrated example, the connection relationship between the sensor electrode Rx1 and the sensor wiring L1 and the connection relationship between the sensor electrode Rxn and the sensor wiring Ln are shown. As described above, the sensor electrode Rx1 is located farther from the touch controller TC than the sensor electrode Rxn. The grid shown in FIG. 2 shows the pixel PX, respectively. Each of the sensor wirings L1 and Ln is arranged between the pixels PX adjacent to the first direction X, respectively.
The number of sensor wirings L1 and Ln is at least one, but in the illustrated example, the number of sensor wirings L1 is larger than the number of sensor wirings Ln. In one example, the sensor wiring L1 is composed of four sensor wirings L11 to L14, and the sensor wiring Ln is composed of two sensor wirings Ln1 and Ln2. The number of each of these sensor wirings L1 and Ln is not limited to the illustrated example.
Similar to the sensor wiring L1, the sensor wirings L2, L3, ... Are also composed of four sensor wirings. Similar to the sensor wiring Ln, the sensor wirings Ln-1, Ln-2, Ln-3, and Ln-4 are also composed of two sensor wirings.
The number of contact portions CT1 in which the sensor electrode Rx1 and the sensor wiring L1 are electrically connected to each other is larger than the number of contact portions CTn in which the sensor electrode Rxn and the sensor wiring Ln are electrically connected to each other. A state in which the number of contact portions CT1 is larger than the number of contact portions CTn can be obtained by applying at least one of the following (A) and (B).
(A) The number of contact portions CT1 per sensor wiring L1 is larger than the number of contact portions CTn per sensor wiring Ln.
(B) The number of contact portions CT1 per sensor wiring L1 is equal to or less than the number of contact portions CTn per sensor wiring Ln, but the number of sensor wiring L1 is larger than the number of sensor wiring Ln. many.

In the example shown in FIG. 2A, the sensor electrode Rx1 corresponds to the first electrode, the sensor electrode Rxn corresponds to the second electrode, the sensor wiring L1 corresponds to the first wiring, and the sensor wiring Ln corresponds to the second wiring. However, the touch controller TC corresponds to the control unit.

FIG. 2B is a plan view showing the connection relationship between the sensor electrode Rx1 shown in FIG. 2A and the sensor wiring L1. The plurality of signal lines S are arranged at intervals in the first direction X. The plurality of scanning lines G are arranged at intervals in the second direction Y. The pixel PX is surrounded by adjacent signal lines S and adjacent scanning lines G.

In the region corresponding to the sensor electrode Rx1, either the sensor wiring L1 or the dummy wiring D is superimposed on any signal line S. As described above, one sensor wiring L1 and the sensor electrode Rx1 are electrically connected to each other by at least one contact portion CT1. One dummy wiring D and the sensor electrode Rx1 are electrically connected to each other by at least one contact portion CD1.

Each of the signal lines S is arranged corresponding to the sensor electrode Rxn from the sensor electrode Rx1 shown in FIG. 2A. FIG. 2A illustrates representative signal lines Sa, Sb, Sc, and Sd among the signal lines S.
Here, attention is paid to the signal line Sa. As shown in FIG. 2B, the sensor wiring L14 is superimposed on the signal line Sa. Further, referring to FIG. 2A, the sensor wiring L14 is superimposed on the entire signal line Sa in the range from the sensor electrode Rx1 to the sensor electrode Rxn.
Focusing on the signal line Sb, the dummy wiring D21 arranged corresponding to the sensor electrode Rx1 is superimposed on the signal line Sb. Similarly, the sensor wiring L21 arranged corresponding to the sensor electrode Rx2 is superimposed on the signal line Sb. However, the dummy wiring D21 is separated from the sensor wiring L21.

FIG. 2C is a plan view showing the connection relationship between the sensor electrode Rxn and the sensor wiring Ln shown in FIG. 2A. In the region corresponding to the sensor electrode Rxn, either the sensor wiring Ln or the dummy wiring D is superimposed on any signal line S. As described above, one sensor wiring Ln and the sensor electrode Rxn are electrically connected to each other by at least one contact portion CTn. One dummy wiring D and the sensor electrode Rxn are electrically connected to each other by at least one contact portion CDn. As shown in FIGS. 2B and 2C, the number of contact portions CD1 is smaller than the number of contact portions CDn.

Focusing on the signal line Sc, the dummy wiring D22 arranged corresponding to the sensor electrode Rx1 and the dummy wiring D41 arranged corresponding to the sensor electrode Rxn are both superimposed on the signal line Sc. .. However, the dummy wiring D22 is separated from the dummy wiring D41.
Focusing on the signal line Sd, the dummy wiring D23 arranged corresponding to the sensor electrode Rx1 and the sensor wiring Ln1 arranged corresponding to the sensor electrode Rxn are both superimposed on the signal line Sd. .. However, the dummy wiring D23 is separated from the sensor wiring Ln1.

In the examples shown in FIGS. 2A to 2C, the dummy wirings D21 to D23 correspond to the first dummy wiring, the dummy wiring D41 corresponds to the second dummy wiring, and the signal line Sa corresponds to the first signal line. The line Sc corresponds to the second signal line, and the signal line Sd corresponds to the third signal line.

As described above, in the touch sensor TS provided with the matrix-shaped sensor electrode Rx, the sensor electrode Rx1 is located farther from the touch controller TC as compared with the sensor electrode Rxn, and is electrically connected to the sensor electrode Rx1. The wiring length LR1 of the sensor wiring L1 connected to the sensor wiring Ln is longer than the wiring length LRn of the sensor wiring Ln electrically connected to the sensor electrode Rxn. Therefore, the time constant of the sensor electrode Rx1 tends to be larger than the time constant of the sensor electrode Rxn. Further, as the distance between the sensor electrode Rx1 and the sensor electrode Rxn increases, the difference between the time constants of the two tends to increase, which may cause a variation in the detection performance of the touch sensor TS.

According to the present embodiment, the number of contact portions CT1 between the sensor electrode Rx1 and the sensor wiring L1 is larger than the number of contact portions CTn between the sensor electrode Rxn and the sensor wiring Ln. Therefore, the difference between the time constant of the sensor electrode Rx1 and the time constant of the sensor electrode Rxn can be reduced as compared with the case where the number of contact portions CT1 is the same as the number of contact portions CTn. Therefore, it is possible to suppress the deterioration of the detection performance as the touch sensor TS.

FIG. 3 is a plan view showing the sensor electrode Rx shown in FIG. In FIG. 3, the direction that intersects the second direction Y at an acute angle counterclockwise is defined as the direction D1, and the direction that intersects the second direction Y at an acute angle clockwise is defined as the direction D2. The angle θ1 formed by the second direction Y and the direction D1 is substantially the same as the angle θ2 formed by the second direction Y and the direction D2.

One sensor electrode Rx is arranged over a plurality of pixels PX. In the illustrated example, the pixel PX located in the odd-numbered rows along the second direction Y extends along the direction D1. Further, the pixel PX located on the even-numbered rows along the second direction Y extends along the direction D2. The pixel PX here indicates the smallest unit that can be individually controlled according to the video signal, and may be referred to as a sub-pixel. Further, the minimum unit for realizing color display may be referred to as a main pixel MP. The main pixel MP is configured to include a plurality of sub-pixels PX that display different colors from each other. In one example, the main pixel MP includes a red pixel that displays red, a green pixel that displays green, and a blue pixel that displays blue as sub-pixel PX. Further, the main pixel MP may include white pixels for displaying white.
In one example, 60 to 70 main pixel MPs are arranged along the first direction X, and 60 to 70 main pixel MPs are arranged along the second direction in one sensor electrode Rx.

FIG. 4 is a diagram showing a basic configuration of a pixel PX and an equivalent circuit. The plurality of scanning lines G are connected to the scanning line drive circuit GD. The plurality of signal lines S are connected to the signal line drive circuit SD. The scanning line G and the signal line S do not necessarily have to extend linearly, and a part of them may be bent. For example, it is assumed that the signal line S extends in the second direction Y even if a part of the signal line S is bent.

The common electrode CE is provided for each sensor block B. The common electrode CE is connected to a voltage supply unit CD of a common voltage (Vcom) and is arranged over a plurality of pixels PX. Further, the common electrode CE is also connected to the touch controller TC as described above, and also functions as a sensor electrode Rx.
Each pixel PX includes a switching element SW, a pixel electrode PE, a common electrode CE, a liquid crystal layer LC, and the like. The switching element SW is composed of, for example, a thin film transistor (TFT), and is electrically connected to the scanning line G and the signal line S. The scanning line G is electrically connected to the gate electrode GE of the switching element SW in each of the pixels PX arranged in the first direction X. The signal line S is electrically connected to the source electrode SE of the switching element SW in each of the pixels PX arranged in the second direction Y. The pixel electrode PE is electrically connected to the drain electrode DE of the switching element SW. Each of the pixel electrode PEs faces the common electrode CE, and the liquid crystal layer LC is driven by the electric field generated between the pixel electrode PE and the common electrode CE. The holding capacitance CS is formed, for example, between an electrode having the same potential as the common electrode CE and an electrode having the same potential as the pixel electrode PE.

FIG. 5 is a plan view showing an example of the pixel layout. Here, the pixel layout in the region straddling the sensor electrodes Rx1 and Rx2 shown in FIG. 1 is enlarged and shown. That is, the illustrated common electrode CE1 corresponds to the sensor electrode Rx1, and the common electrode CE2 corresponds to the sensor electrode Rx2. The scanning lines Ga, Gb, and Gc each extend linearly along the first direction X and are arranged at intervals in the second direction Y. The signal lines S1 to S3 extend substantially along the second direction Y, and are arranged at intervals in the first direction X.

The pixel electrodes PE1 and PE2 are arranged between the scanning lines Ga and Gb. The pixel electrodes PE1 and PE2 are arranged along the first direction X. The pixel electrodes PE3 and PE4 are arranged between the scanning lines Gb and Gc. The pixel electrodes PE3 and PE4 are arranged along the first direction X. The pixel electrodes PE1 and PE3 are arranged between the signal lines S1 and S2, and the pixel electrodes PE2 and PE4 are arranged between the signal lines S2 and S3.
The pixel electrodes PE1 and PE2 have band electrodes Pa1 and Pa2 extending along the direction D1, respectively. The pixel electrodes PE3 and PE4 have band electrodes Pa3 and Pa4 extending along the direction D2, respectively. In the illustrated example, the number of band electrodes Pa1 to Pa4 is two, but it may be one or three or more.

The common electrodes CE1 and CE2 correspond to the sensor electrodes Rx1 and Rx2 shown in FIG. 1, respectively. The common electrode CE1 is superimposed on the scanning lines Ga and the signal lines S1 to S3. The pixel electrodes PE1 and PE2 are superimposed on the common electrode CE1. The common electrode CE2 is superimposed on the scanning lines Gc and the signal lines S1 to S3. The pixel electrodes PE3 and PE4 are superimposed on the common electrode CE2. The common electrode CE2 is separated from the common electrode CE1 and is electrically isolated from each other. In the illustrated example, the scan line Gb is located between the common electrodes CE1 and CE2. Similarly, other common electrodes or other sensor electrodes are superimposed on the plurality of pixel electrodes.

FIG. 6 is a cross-sectional view of the display device DSP along the line AB shown in FIG. The illustrated example corresponds to an example in which the FFS (Fringe Field Switching) mode, which is one of the display modes using a lateral electric field, is applied. The display device DSP includes a display panel PNL, optical elements OD1 and OD2, and a lighting device IL. The lighting device IL, the optical element OD1, the display panel PNL, and the optical element OD2 are arranged in this order along the third direction Z. The display panel PNL includes a first substrate SUB1, a second substrate SUB2, and a liquid crystal layer LC.

The first substrate SUB1 includes an insulating substrate 10, insulating films 11 to 16, signal lines S2 and S3, metal wirings ML2 and ML3, a common electrode CE1, a pixel electrode PE2, an alignment film AL1, and the like. The insulating substrate 10 is a substrate having light transmittance such as a glass substrate or a flexible resin substrate. The insulating films 11 to 13 are arranged on the insulating substrate 10 in this order along the third direction Z.
The signal lines S2 and S3 are located on the insulating film 13 and are covered with the insulating film 14. The signal lines S2 and S3 are located in the same layer as other signal lines S1 (not shown). The signal lines S2 and S3 are made of metal materials such as aluminum (Al), titanium (Ti), silver (Ag), molybdenum (Mo), tungsten (W), copper (Cu), and chromium (Cr), and these metals. It is formed of an alloy or the like in which materials are combined, and may have a single-layer structure or a multi-layer structure. In one example, the signal lines S2 and S3 are laminated bodies in which titanium (Ti), aluminum (Al), and titanium (Ti) are laminated in this order.

The metal wirings ML2 and ML3 are located on the insulating film 14 and are covered with the insulating film 15. The metal wiring ML2 is located directly above the signal line S2, and the metal wiring ML3 is located directly above the signal line S3. The metal wirings ML2 and ML3 are formed of the above-mentioned metal material, an alloy in which the above-mentioned metal materials are combined, or the like, and may have a single-layer structure or a multi-layer structure. In one example, the metal wirings ML2 and ML3 are a laminate in which titanium (Ti), aluminum (Al), and titanium (Ti) are laminated in this order, or molybdenum (Mo), aluminum (Al), and molybdenum (Mo). ) Are laminated in order. These metal wirings ML2 and ML3 correspond to any of the above-mentioned sensor wirings and dummy wirings.

The common electrode CE1 is located on the insulating film 15 and is covered with the insulating film 16. The common electrode CE1 is a transparent electrode formed of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO). The pixel electrode PE2 is located on the insulating film 16 and is covered with the alignment film AL1. The pixel electrode PE2 is a transparent electrode formed of a transparent conductive material such as ITO or IZO.

The insulating films 11 to 13 and the insulating film 16 are inorganic insulating films formed of an inorganic insulating material such as silicon oxide, silicon nitride, or silicon oxynitride, and may have a single-layer structure. It may have a multi-layer structure. The insulating films 14 and 15 are organic insulating films formed of an organic insulating material such as acrylic resin. The insulating film 15 may be an inorganic insulating film.

The second substrate SUB2 includes an insulating substrate 20, a light-shielding layer BM, a color filter CF, an overcoat layer OC, an alignment film AL2, and the like.
Like the insulating substrate 10, the insulating substrate 20 is a substrate having light transmittance such as a glass substrate or a resin substrate. The light-shielding layer BM and the color filter CF are located on the side of the insulating substrate 20 facing the first substrate SUB1. The color filter CF is arranged at a position facing the pixel electrode PE2, and a part of the color filter CF overlaps the light-shielding layer BM. The color filter CF includes red, green, and blue color filters. The overcoat layer OC covers the color filter CF. The overcoat layer OC is formed of a transparent resin. The alignment film AL2 covers the overcoat layer OC. The alignment film AL1 and the alignment film AL2 are formed of, for example, a material exhibiting horizontal orientation. The first substrate SUB1 and the second substrate SUB2 described above are arranged so that the alignment film AL1 and the alignment film AL2 face each other.

The liquid crystal layer LC is located between the first substrate SUB1 and the second substrate SUB2, and is held between the alignment film AL1 and the alignment film AL2. The liquid crystal layer LC includes a liquid crystal molecule LM. The liquid crystal layer LC is composed of a positive type (positive dielectric anisotropy) liquid crystal material or a negative type (negative dielectric anisotropy) liquid crystal material.

The optical element OD1 including the polarizing plate PL1 is adhered to the insulating substrate 10. The optical element OD2 including the polarizing plate PL2 is adhered to the insulating substrate 20. The optical element OD1 and the optical element OD2 may be provided with a retardation plate, a scattering layer, an antireflection layer, and the like, if necessary.

In such a display panel PNL, in an off state in which an electric field is not formed between the pixel electrode PE2 and the common electrode CE1, the liquid crystal molecule LM is initially placed in a predetermined direction between the alignment film AL1 and the alignment film AL2. It is oriented. In such an off state, the light emitted from the lighting device IL toward the display panel PNL is absorbed by the optical element OD1 and the optical element OD2, resulting in dark display. On the other hand, in the on state where an electric field is formed between the pixel electrode PE2 and the common electrode CE1, the liquid crystal molecule LM is oriented in a direction different from the initial orientation direction by the electric field, and the orientation direction is controlled by the electric field. .. In such an on state, a part of the light from the illuminating device IL passes through the optical element OD1 and the optical element OD2 and becomes a bright display.

FIG. 7 is an enlarged plan view showing a main part of the first substrate SUB1. It should be noted that the illustration of scanning lines, pixel electrodes, semiconductor layers, etc. is omitted here.

The first substrate SUB1 further includes drain electrodes DE1 and DE2, and connection electrodes BE1 and BE2. Each of the signal lines S1 to S3 extends along the direction D1, a portion extending along the direction D2, and a portion extending along the second direction Y at the position where the signal lines S1 to S3 overlap with the common electrode CE1. Has a part and. The metal wirings ML1 to ML3 are superimposed on the signal lines S1 to S3, respectively. The metal wirings ML1 to ML3 are arranged along the first direction X at intervals.

The drain electrodes DE1 and DE2 are each formed in an island shape. The drain electrode DE1 is arranged between the signal line S1 and the signal line S2, and the drain electrode DE2 is arranged between the signal line S2 and the signal line S3. The drain electrodes DE1 and DE2 are located in the same layer as the signal line S2 and the like, and are formed of the same material as the signal line S2.
The connection electrodes BE1 and BE2 are each formed in an island shape. The connection electrode BE1 is superimposed on the drain electrode DE1, and the connection electrode BE2 is superimposed on the drain electrode DE2. The connection electrode BE1 is in contact with the drain electrode DE1 via the contact hole CH10. The connection electrode BE2 is in contact with the drain electrode DE2 via the contact hole CH20. The connection electrodes BE1 and BE2 are located in the same layer as the metal wiring ML2 and the like, and are formed of the same material as the metal wiring ML2.

Here, attention is paid to the signal line S2 and the metal wiring ML2. For example, the metal wiring ML2 corresponds to either the sensor wiring L11 or the dummy wiring D shown in FIG. 2B. The signal line S2 has a contact portion CTA that contacts the semiconductor layer described later. The contact portion CTA is extended in the first direction X more than the other wiring portions. The metal wiring ML2 has a contact portion CTB in contact with the common electrode CE1. The contact portion CTB is superimposed on the contact portion CTA. When the metal wiring ML2 corresponds to the sensor wiring L11, the contact portion CTB corresponds to the contact portion CT1 shown in FIG. 2B. Further, when the metal wiring ML2 corresponds to the dummy wiring D21, the contact portion CTB corresponds to the contact portion CD1 shown in FIG. 2B.

The common electrode CE1 has an opening OP superimposed on the metal wiring ML2. The illustrated opening OP is a slit extending along direction D2. The opening OP has a width WOP. The metal wiring ML2 has a width WM2 at a position where it overlaps with the opening OP. The width WM2 is smaller than the width WOP. The metal wiring ML2 is located inside the opening OP. The signal line S2 has a width WS2. The width WS2 is smaller than the width WM2. The signal line S2 is located inside the metal wiring ML2. The width in the present specification corresponds to the length along the first direction X. The common electrode CE1 has a similar opening OP even in a region where it overlaps with other metal wirings ML1 and ML3. Further, the other common electrode CE (or the sensor electrode Rx) also has an opening OP in a part of the region overlapping with the metal wiring ML (or the sensor wiring L and the dummy wiring D).

As shown by the dotted line in the figure, the spacer SP is located between the connection electrodes BE1 and BE2 and is superimposed on the common electrode CE1.

FIG. 8 is a cross-sectional view of the first substrate SUB1 along the CD line shown in FIG. 7. The first substrate SUB1 further includes a semiconductor layer SC, scanning lines G, and the like. The semiconductor layer SC is located on the insulating film 11 and is covered with the insulating film 12. The semiconductor layer SC is formed of, for example, polycrystalline silicon, but may be formed of amorphous silicon or an oxide semiconductor. The scanning line G is located on the insulating film 12 and is covered with the insulating film 13. The scanning line G is formed by using the above-mentioned metal material.
The contact portion CTA of the signal line S2 is in contact with the semiconductor layer SC through the contact hole CH1 penetrating the insulating film 12 and the insulating film 13. The metal wiring ML2 is located on the insulating film 14 and is covered with the insulating film 15. The contact portion CTB of the metal wiring ML2 is in contact with the common electrode CE1 through the contact hole CH3 penetrating the insulating film 15.

FIG. 9 is a cross-sectional view of the display panel PNL along the line EF shown in FIG. The connection electrode BE1, the metal wiring ML2, and the connection electrode BE2 are arranged in this order at intervals along the second direction Y and are located in the same layer. The connection electrode BE1 is in contact with the drain electrode DE1 through the contact hole CH10 penetrating the insulating film 14. The connection electrode BE2 is in contact with the drain electrode DE2 through the contact hole CH20 penetrating the insulating film 14.
The pixel electrodes PE11 and PE12 are located on the insulating film 16 and are covered with the alignment film AL1. The pixel electrode PE 11 is located directly above the connection electrode BE1 and contacts the connection electrode BE1 through the contact hole CH11 penetrating the insulating film 15 to the connection electrode BE1 and the contact hole CH12 penetrating the insulating film 16 to the connection electrode BE1. are doing. Similarly, the pixel electrode PE12 is located directly above the connection electrode BE2 and is in contact with the connection electrode BE2 through the contact hole CH21 penetrating the insulating film 15 and the contact hole CH22 penetrating the insulating film 16.

The spacer SP is provided on the second substrate SUB2. The spacer SP is located between the first substrate SUB1 and the second substrate SUB2, and forms a cell gap between the first substrate SUB1 and the second substrate SUB2. The cell gap is, for example, 2 to 5 μm. The spacer SP is formed of, for example, a resin material. In the first substrate SUB1 directly under the spacer SP, the signal line S2, the insulating film 14, the metal wiring ML2, the insulating film 15, the common electrode CE1, the insulating film 16, and the alignment film AL1 are arranged in this order along the third direction Z. It is laminated. A semiconductor layer is arranged between the insulating films 11 and 12 directly under the signal line S2, but the illustration is omitted.

FIG. 10 is a diagram for explaining the capacitance C1 between the common electrode CE1 and the metal wiring ML2. As shown, when the common electrode CE1 is superimposed on the metal wiring ML2 via the insulating film 15, the capacitance C1 is generated. The capacitance C1 is reduced as the film thickness of the insulating film 15 is thicker. Further, the capacitance C1 is reduced as the dielectric constant of the insulating film 15 is lower. Considering these points, when the insulating film 15 is a relatively thick organic insulating film, the capacitance C1 can be reduced.

FIG. 11 is a diagram showing a case where the sensor wiring L1 connected to the sensor electrode Rx1 is four, and FIG. 12 is a diagram showing a case where the sensor wiring L1 connected to the sensor electrode Rx1 is one. As described above, as one method for reducing the time constant of the sensor electrode Rx1 located far from the touch controller TC, there is a method for increasing the number of sensor wirings L1 connected to the sensor electrode Rx1. However, when the number of sensor wirings L1 is four as in the example shown in FIG. 11, the sensors other than the sensor electrode Rx1 are compared with the case where the sensor wiring L1 is one as in the example shown in FIG. The portion overlapping with the electrode increases, and the capacitance C1 increases. Therefore, as the number of sensor wirings L1 increases, the capacitance C1 increases, and there is a possibility that the effect of reducing the time constant cannot be sufficiently exhibited.

According to the present embodiment, as described with reference to FIG. 7, the common electrode CE1 has an opening OP that overlaps with the metal wiring ML2. Therefore, the capacitance C1 between the common electrode CE1 and the metal wiring ML2 can be reduced. Therefore, even if the number of sensor wirings L1 connected to the sensor electrode Rx1 located far from the touch controller TC is increased, the increase in the capacitance C1 can be suppressed and the time constant reduction effect can be obtained.

As described above, according to the present embodiment, it is possible to provide a display device that suppresses a decrease in detection performance.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and variations thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

The display panel PNL of the present embodiment is not limited to the transmissive type having a transmissive display function of displaying an image by selectively transmitting light from the back side of the first substrate SUB1, but the front side of the second substrate SUB2. It may be either a reflection type having a reflection display function for displaying an image by selectively reflecting light from the light source, or a semi-transmissive type having a transmission display function and a reflection display function.
Further, in the present embodiment, the display panel PNL corresponding to the display mode using the lateral electric field along the main surface of the substrate has been described, but the present invention is not limited to this, and the vertical electric field along the normal of the main surface of the substrate is used. Any of the display modes corresponding to the display mode, the display mode using the gradient electric field inclined diagonally with respect to the main surface of the substrate, and the display mode using the above-mentioned transverse electric field, longitudinal electric field, and gradient electric field in combination as appropriate. It may be a display panel. The main surface of the substrate here is a surface parallel to the XY plane.

DSP ... Display device PNL ... Display panel CE ... Common electrode ML ... Metal wiring TS ... Touch sensor Rx ... Sensor electrode L ... Sensor wiring D ... Dummy wiring OP ... Opening S ... Signal line PE ... Pixel electrode

Claims (9)

With the first electrode
The second electrode separated from the first electrode and
With at least one first wire electrically connected to the first electrode,
With at least one second wire electrically connected to the second electrode,
A control unit electrically connected to the first wiring and the second wiring is provided.
The first electrode and the second electrode are located on the display unit and are located on the display unit.
The first electrode is connected to the first wiring at a position farther from the control unit than the second electrode.
The second electrode is connected to the second wiring at a position closer to the control unit than the first electrode.
A display device in which the number of the first wiring is larger than the number of the second wiring. The display device according to claim 1, wherein the number of contact portions between the first electrode and the first wiring is larger than the number of contact portions between the second electrode and the second wiring. The first wiring intersects with the first electrode and the second electrode.
The display device according to claim 1 or 2, wherein the second wiring intersects with the second electrode and does not intersect with the first electrode. With the first electrode
The second electrode separated from the first electrode and
The first wiring electrically connected to the first electrode and
A second wiring electrically connected to the second electrode is provided.
The first electrode and the second electrode are located on the display unit and are located on the display unit.
The wiring length of the first wiring is longer than the wiring length of the second wiring.
The first wiring intersects with the first electrode and the second electrode.
The second wiring intersects with the second electrode and
The second electrode is a display device having an opening superimposed on the first wiring . The display device according to claim 4, wherein the number of contact portions between the first electrode and the first wiring is larger than the number of contact portions between the second electrode and the second wiring. The opening has a first width and has a first width.
The display device according to claim 4 , wherein the first wiring has a second width smaller than the first width at a position overlapping with the opening. Further, the first dummy wiring arranged corresponding to the first electrode and
A second dummy wiring arranged corresponding to the second electrode is provided.
The item according to any one of claims 1 to 6 , wherein the number of contact portions between the first electrode and the first dummy wiring is smaller than the number of contact portions between the second electrode and the second dummy wiring. Display device. Further, a first signal line intersecting with the first electrode and the second electrode is provided.
The display device according to claim 7 , wherein the first wiring is superimposed on the first signal line. Further, a second signal line intersecting with the first electrode and the second electrode is provided.
The display device according to claim 7 , wherein the first dummy wiring and the second wiring are superimposed on the second signal line.

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